It looks like that serial number range was made in approximately March of 1990, it's probably a Gen2 (heavy checkering on the front and rear faces of the grip, and a fine stippled-type pattern on the side panels, but no finger-grooves or thumb-rest-bump like the current Gen3 and Gen4 Glocks). Probably has a nice smooth trigger action (maybe a bit lighter trigger pull weight, too), as many of the earlier Glocks did.
This Glock is old enough that it may need the internal parts upgrade offered free by Glock. To find out if it was ever upgraded by any earlier owners, call Glock's customer service number, and tell then you need to check and see if your new-to-you old Glock needs any upgrades (they will have a record at the facility if it was ever upgraded, as in the past, all upgrades were ONLY done at the factory or factory-approved facilities).
If it is clean and properly lubricated, and the magazine is in good shape (often, mags get a bit dinged-up from being dropped), it should run VERY reliably. After testing it with a new mag and modern ammo, and assuming it showed no problems in testing, I wouldn't hesitate to carry it for defensive use. I carried a slightly newer Gen2 Glock 19 very similar to yours for almost ten years, until I "converted" to using the Gen3 Glocks (the finger-grooves really work well for me, keeping the pistol firmly anchored in my hand). There was nothing wrong with the old G19, I just liked the "feel" of the newer models better.